/// <summary>
        /// creates a new command
        /// </summary>
        /// <param name="method">the method</param>
        /// <param name="invokeInstance">the instance to invoke the method on (or null for static methods)</param>
        public void AddMethod(SpeechMethod method, object invokeInstance)
        {
            Dictionary <string, SpeechGroupTuple> langCommands;

            //create lang if not exists
            if (Commands.TryGetValue(method.Lang, out langCommands) == false)
            {
                langCommands = new Dictionary <string, SpeechGroupTuple>();
                Commands.Add(method.Lang, langCommands);
            }


            //add the method to the right speech group

            SpeechGroupTuple speechGroup;

            if (langCommands.TryGetValue(method.SpeechGroupKey, out speechGroup) == false)
            {
                speechGroup = new SpeechGroupTuple(true);
                langCommands.Add(method.SpeechGroupKey, speechGroup);
            }

            //check all synonyms

            if (method.SpeechNames.Any(p => speechGroup.Commands.ContainsKey(p)))
            {
                //there is a synonyme that is already another speech name in this speech group -> invalid
                throw new Exception("speech dictionary already contains a method with speech name: " + method.SpeechNames + " and key: " + method.Key);
            }
            else
            {
                var cmd = new SpeechTuple(true, method, invokeInstance);
                foreach (var speechName in method.SpeechNames)
                {
                    speechGroup.Commands.Add(speechName, cmd); //same command with different names...
                }
            }
        }
        /// <summary>
        /// creates a new command
        /// </summary>
        /// <param name="method">the method</param>
        /// <param name="invokeInstance">the instance to invoke the method on (or null for static methods)</param>
        public void AddMethod(SpeechMethod method, object invokeInstance)
        {
            Dictionary<string, SpeechGroupTuple> langCommands;

            //create lang if not exists
            if (Commands.TryGetValue(method.Lang, out langCommands) == false)
            {
                langCommands = new Dictionary<string, SpeechGroupTuple>();
                Commands.Add(method.Lang, langCommands);
            }

            //add the method to the right speech group

            SpeechGroupTuple speechGroup;

            if (langCommands.TryGetValue(method.SpeechGroupKey, out speechGroup) == false)
            {
                speechGroup = new SpeechGroupTuple(true);
                langCommands.Add(method.SpeechGroupKey, speechGroup);
            }

            //check all synonyms

            if (method.SpeechNames.Any(p => speechGroup.Commands.ContainsKey(p)))
            {
                //there is a synonyme that is already another speech name in this speech group -> invalid
                throw new Exception("speech dictionary already contains a method with speech name: " + method.SpeechNames + " and key: " + method.Key);
            }
            else
            {
                var cmd = new SpeechTuple(true, method, invokeInstance);
                foreach (var speechName in method.SpeechNames)
                    speechGroup.Commands.Add(speechName, cmd); //same command with different names...
            }
        }